Launch Windows Packaged Project as Server / Join Server by IP

Hi all,
I’m trying to work out how you can launch a Windows packaged project as a server then launch another specifying the server IP to join.
I know you can do this via command line when you have a uncooked project, but can’t find any working examples how you do it for a packaged one and what options are available i.e. is server, what level to open etc.